Dapper Don on Secrets and Agents

The rasp ofJon Hamm's voice brings to mind the many cigarettes smoked by his "Mad Men" character Don Draper. In reality, the actor is hoarse from shooting the show, whose sixth season begins on Sunday, six years after it helped trigger an influx of quality dramas on basic cable.

Don Draper is a magnetic and inscrutable ad man with a secret past. Mr. Hamm's own back story—a long-struggling actor who hung out with a lot of...

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